Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, le thanh
hai cuu » hai cua, hai chu, hai cuc
va tinh » may tinh
tu sach » thu sach, te sach, tu cach
cac tao » cau tao, cac tro, cac tac
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ky nang xa hoi. hieu vien cac tao ((va thanh) OR (va tinh)) hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu vien cac tao ((va thanh) OR (va tinh)) hai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang xa hoi. hieu vien cac tao ((va thanh) OR (va tinh)) hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu vien cac tao ((va thanh) OR (va tinh)) hai cuu tre*.